Cheers Ed will give that a try. It is a little tight on the clearance with the durano plus, I would believe it wouldn't have been an issue with contiential tyres.
Yeah, you want the larger gap on top/exit point for safety reasons too: twigs and such will get jammed more easily if the "tunnel" tapers as they travel 'round the tire.
I am very impress you managed to fit that on a Canyon with 25mm even.
You just need to move the bottom front closer to the wheel to bring more room on the top end of the mudguard.